'use strict'
const path = require('path')
const defaultSettings = require('./src/settings.js')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const name = defaultSettings.title || 'vue Admin Template' // page title

// If your port is set to 80,
// use administrator privileges to execute the command line.
// For example, Mac: sudo npm run
// You can change the port by the following methods:
// port = 9528 npm run dev OR npm run dev --port = 9528
const port = process.env.port || process.env.npm_config_port || 8888 // dev port

let externalsObj = {}
let cdnScripts = []
let cdnCss = []
if (process.env.NODE_ENV === 'production') {
  externalsObj = {
    vue: 'Vue',
    'element-ui': 'ELEMENT',
    xlsx: 'XLSX'
  }
  cdnScripts = [
    'https://lib.baomitu.com/vue/2.6.10/vue.min.js',
    'https://lib.baomitu.com/element-ui/2.13.2/index.js',
    'https://lib.baomitu.com/xlsx/0.18.5/xlsx.full.min.js'
  ]
  cdnCss = ['https://lib.baomitu.com/element-ui/2.13.2/theme-chalk/index.css']
}
// All configuration item explanations can be find in https://cli.vuejs.org/config/
module.exports = {
  /**
   * You will need to set publicPath if you plan to deploy your site under a sub path,
   * for example GitHub Pages. If you plan to deploy your site to https://foo.github.io/bar/,
   * then publicPath should be set to "/bar/".
   * In most cases please use '/' !!!
   * Detail: https://cli.vuejs.org/config/#publicpath
   */
  publicPath: '/',
  outputDir: 'dist',
  assetsDir: 'static',
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  // 开发时候服务器配置（npm run dev 的时候，所加载的配置）
  devServer: {
    port: port, // 项目运行的端口
    open: true, // 表示 npm run dev 的时候，自动加载打开浏览器看效果
    overlay: {
      warnings: false,
      errors: true
    },

    // 做 API 接口的转发（代理）
    // 请求的原地址，会失败：  http://localhost:8888/dev-api/sys/login
    // 目标的请求地址，会成功：http://ihrm-java.itheima.net/api/sys/login
    proxy: {
      // 键：值
      // 键：请求源地址中的某一部分
      // 值：目标地址的配置项
      '/dev-api': {
        // target: '目标地址'
        // 设置完 target 之后，请求的地址变成了 http://ihrm-java.itheima.net/dev-api/sys/login
        target: 'http://ihrm-java.itheima.net',
        // 路径片段的替换和重写
        // 设置完 pathRewrite 之后，请求的地址变成了 http://ihrm-java.itheima.net/api/sys/login
        pathRewrite: {
          'dev-api': '/api'
        },
        changeOrigin: true // 开启跨域调用接口的功能
      }
    }
  },
  configureWebpack: {
    // provide the app's title in webpack's name field, so that
    // it can be accessed in index.html to inject the correct title.
    name: name,
    resolve: {
      alias: {
        '@': resolve('src')
      }
    },
    externals: externalsObj
  },
  chainWebpack(config) {
    config.plugin('html').tap(args => {
      args[0].cdnScripts = cdnScripts
      args[0].cdnCss = cdnCss
      return args
    })
    // it can improve the speed of the first screen, it is recommended to turn on preload
    config.plugin('preload').tap(() => [
      {
        rel: 'preload',
        // to ignore runtime.js
        // https://github.com/vuejs/vue-cli/blob/dev/packages/@vue/cli-service/lib/config/app.js#L171
        fileBlacklist: [/\.map$/, /hot-update\.js$/, /runtime\..*\.js$/],
        include: 'initial'
      }
    ])

    // when there are many pages, it will cause too many meaningless requests
    config.plugins.delete('prefetch')

    // set svg-sprite-loader
    config.module.rule('svg').exclude.add(resolve('src/icons')).end()
    config.module
      .rule('icons')
      .test(/\.svg$/)
      .include.add(resolve('src/icons'))
      .end()
      .use('svg-sprite-loader')
      .loader('svg-sprite-loader')
      .options({
        symbolId: 'icon-[name]'
      })
      .end()

    config.when(process.env.NODE_ENV !== 'development', config => {
      config
        .plugin('ScriptExtHtmlWebpackPlugin')
        .after('html')
        .use('script-ext-html-webpack-plugin', [
          {
            // `runtime` must same as runtimeChunk name. default is `runtime`
            inline: /runtime\..*\.js$/
          }
        ])
        .end()
      config.optimization.splitChunks({
        chunks: 'all',
        cacheGroups: {
          libs: {
            name: 'chunk-libs',
            test: /[\\/]node_modules[\\/]/,
            priority: 10,
            chunks: 'initial' // only package third parties that are initially dependent
          },
          elementUI: {
            name: 'chunk-elementUI', // split elementUI into a single package
            priority: 20, // the weight needs to be larger than libs and app or it will be packaged into libs or app
            test: /[\\/]node_modules[\\/]_?element-ui(.*)/ // in order to adapt to cnpm
          },
          commons: {
            name: 'chunk-commons',
            test: resolve('src/components'), // can customize your rules
            minChunks: 3, //  minimum common number
            priority: 5,
            reuseExistingChunk: true
          }
        }
      })
      // https:// webpack.js.org/configuration/optimization/#optimizationruntimechunk
      config.optimization.runtimeChunk('single')
    })
  }
}
